Popup calendar showing wrong week number.

Hi, I can't find out what to do.

My calendar on front show the correct week number, but the popup calendar in edit mode shows wrong number... Can you help?

Best regards

[attachment=1:c4glqevf]<!-- ia1 -->edit.PNG<!-- ia1 -->[/attachment:c4glqevf]
[attachment=0:c4glqevf]<!-- ia0 -->front.PNG<!-- ia0 -->[/attachment:c4glqevf]

PHP Version : 7.0.2
MySQL Version : 5.5.47-MariaDB-1~wheezy
Server Information : Linux web212 4.1.12-20151123-0935-16fafb8 #1 SMP Mon Nov 23 09:37:22 UTC 2015 x86_64
Fix jQuery? : Yes
Load JEvents Bootstrap CSS? : Yes
Max Input Vars ? : 5000
Club code set? : No
User Agent : Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36
Joomla : 3.5.0
component_com_jevents : 3.4.8
component_com_jce : 2.5.15
module_mod_jevents_cal : 3.4.8
module_mod_jevents_custom : 3.4.8
module_mod_jevents_filter : 3.4.8
module_mod_jevents_latest : 3.4.8
module_mod_jevents_legend : 3.4.8
module_mod_jevents_switchview : 3.4.8
plugin_content_jevents : 3.4.8
plugin_finder_jevents : 3.4.8
plugin_search_eventsearch : 3.4.8
plugin_system_gwejson : 3.4.8